Machine-tool.



L B. FRANZ. MACHINE ToQL.

V PPLICTIOH TLIID TBB. l0, 1934. 917.577. f l Patented Apr. 6, 1909. 2 SHEETS-SHEET 2.

fw l

W70/mins' "Uirrnn STATES, PATENT oFFiCE.

BERNHARD FRANZ, Oll` LEIPZIG-PliqlGWl'lZ, GERMANY, ASSIGNUR 'lU FRANZ Si MASSMAN,

. OF LEIPZIG-LINDENAU, GERMANY, A FlRM.

MACHINE-TOOL.

Patented pin o, loos.

Application `tiled February 10, 1904. Serial No. 192,919.

To all whom. it may concern: Bc it known tluit l., BERNHARD Fuisz, u lsubject of' the Emperor of Germany, residing nt 2() Giesscrstrcssc, [.eipzigllugwitz, in the Empire of Germany, unmufuctni'er, here in Y vented certain new und useful Im movements in lllucliine-Tools, of which the fo lowing:r is :L specification. y

Thin invention relates to machine tools in which the feed or rei-setting; of the work or of the 'tool for the next operation is eli'ected automatically. Au obiect o the invention is to enlise the feed or rit-setting of the work or of the tool to time pince on t re one hand hiringr the rcturn movement, und on vthe other hund j directly by means of the mechanism Hiroducing the return, sri that n specinl divi( ing deviceisunneeessury.` This is attained owing to the fr t that the truin of gearing producing the Spirnl retrii'ctive rotation is temporarily thrown out of gen1' so that' tho backward rotation is interrupted for'the time being,

whereby the retractive spiral' rotation of the during the return.

Another object of the invention is toso change the relative positive movement. of tool und work on the return that either the work or the tool remains behind or is fed forward. ln this nimmer the machine tool is simplilied end time gninod in its operation. Here particularly is it possible by menus of the novel method of diridiuv orsi-setting; to

l'l i multe the machine tool entirely nutonuxtir und to arrange it for comin'xous operai-tion. An niiportunt point is that :my desired division may be cli'ecled with the greatest nccurucywithout thiI cmpldrment of spor-ml dividing plates, bccnuso llu.I division or rcsetting is not dependent upon the di'risiou of n circle, but merely upon the mcnsurenimil ol' u path the length of which muy he calculated m correspondence with the desired division ,und exactly defined.

ln this type ol' iuuchiuc it is desirable that kthe too! should certiiiidy be removed from the cut which it. has mede in the work before beginning of'the setting. To this end, the

tool ispreferobly moved out of reach of the work nutoninticnlly und suddenly. 'This muy be ell'ccted by means ol u. iower storing dcvice b v the intermediary oi which, upon the release of u locking holt the tool is displaced. A device of this kind may be formed in du pli` carte so that inthe lirst pince it produces the forward movement of the tool and in the second plnco its backward movement. This speedy throwing in und out of geur of4 the tool presents the advantage that these operotious will certninl) be terminated before the muchinc l. ins its opcrutions.

A milling.; nuichine is illustrated by wny of exnmple iu the accompanying drawing, in

Figure 1 shows the some in side. elevation. Fig. 2 is un end elevation. A nicntnry view similar to Fig. l, sho-wing the parte in n different position. Fig. 4 is n side view opposite thirtshown in Fig. 3 with ports omitted und showingy the means for operating1 the locking; boh. Fig. 5 is on und View of Fig. 4; and Figs. 6 und 7 :ire detuil sectional views.

In the example illuslrirted the spindle 1 Amounted in the houd stock .2 serves for the reception of the. tool 3. hihtlu slide or cnri'iaigc 4 carries thc spindle for the work. 'lhL` geur heels mounted ou the headstocl; or tool holder '.2 und on the :didi` or -oi'riuge 4, muy be of any appropriatikind und uri-zingemcni, in :woor-dunne with the purpose to 'he cll'ccr-d by the nun-hina. lf, for exemple. the milling mur-hina is emplqvud for cutting the s iii-:d gmini?. ol u drill, the tool s )indle l should he tim-d ith :i'suiinbhinvlinxui'on upon the hcudsloch -'l`his lauter is provided ith n. sliduuny din order thnt .by roiziting the spindle T it muy bc mused o:=pprout-h or rei-cdc from thv work. 1

The for ard .fwd und the return ofthe cnr-- ringo 4 is cll'cctvd hy menus of the spindle S. By the roml ion of lthe spindle b in one diiec- A lion or thc other, the, curriugc l with the work is reriprocnted nil the Aknown nimmer.

Ai the sono` limithe work on the spindle 5 is positively` rotated, us is ner-rssaly for the iniuiufm-tuie of spiral driils. 'lhe spiidlc 5' with the noi-h is driven lrom the spindle 8 by the interuiedinr)- of the geur wheels 9,10,

l1 und the shaft 1;', which by mennev of additional geur wheels i3, 14,15, 1C and 17 mounted on the cnrriie 4,j operates the worin geur 1S and 19 ircctly driving the Fig. 3 is n. l'rug- 'l v t 'z l' l spindxe o, (see Fi r. .5 .t In addition tnere is the spur wheel 11 loosely upon the sha1' t 12 und with the same, is suitably mounted upon the bearing 22. The other heli 21 of the clutch is slidubly mounted by means of a move and feather upon the shaft- 12. The ent lever 23 pivoteu to the clutch member 2i and eeted upon by the spring 14, maintains the eluteh normally closed. b l

The temporary disengagements of the clutch during the return of the cai-ringe 4 ere produced by means of tit mets '.25 or by means of a striking ledge o suitable length, mounted upon the rod 26 rigidly attached to the carriage 4. The top )ets 25 cooperate with the projection :27 on die bent lever '23. The tappets .25 are so arranged on the rod 26 that they do not engage the projection 27 of the lever 23 on the beginning of the return movement of the carriage. Dining; the forward inovenient of the curringe 4 in the direction indicntedli the arrow in Fig. 1,A that is to sny during t e feed of the work, the elutel'1'20, 21 is maintained closed as a esult of the oet-ion of the spring 24, so ,that ,the shaft 12 remains coupled with the geur wheel 11 and the spindlef) wit-h the work is rotated.

` During the return movement ofthe carriage 4 in the direction indicated by the arrow in Fig. 3, on the other hand, the parts of the rluteh are disengaged as soon es their. pets .25 enci'ninter the stop 27 und held isongiigedso long us the tzippets are held' in engagement with the sie The duration of this disengagement is 'ependent upon the arrangement of th'.` te )pets and the length of the tiippets :E5 and of t e stop '27,i1ccordingly the length of the disengaged path determines the anguliir amount of the. traverse or feed.

The automatic application and 'withdrawal of the tool is effet-ted in the following manner: The geur wheel 2S mounted on the shaft 2S) enifa'ges with the gearwheel t) of the mitin spint le S. Upon Vthe shaft 29 is also mounted n geur wheel Il() which meshes wivli a geni'. wheel :il which is not move-hie laterally. The huh of this gear wheel :il is screw threaded :uid constitutes a srrewnut .for a screw cou iling 32, which is mounted upon a. rod 3:5 y menus of n groove und feat-her in such :i nimmer :is to e slidalzle toward both sides, hut not rotatrlile. The two pistons 36 und 39 uri'. lixid to the ends of the rod 33. The position of'the sleeve 32 und the transmission rntio nre so selected tlnit upon the terniiinition of the foi-wurd und return movements of the ein-ringe 4, one

the springl 34 n guinsi, the piston 3Q. The piston 36 is provided with two recesses 37 und 38 in one or other of which u locking holtsii is :dilo to opgave.

upon the freine of the nniehine and having :it its lower end e ernnk pin envaging the said holt. .On the up er end of tliie'rod is a tap et 47 ley means o which the said rod is osci lated hy the reciprocating slide or eari'ifige 4. On the fixed hearing 22 and on the carriage d are hearings 50, in which a The engagement und disengagement oia this lockinglmlt is effected hy means of the rod 45 rotntnhly mounted.

slidnble rod 5l is held.V 0n the rod 5l ere rings or shoulders-52 with which the bearings 50 of the carriage Contact sons to slide the rod 51 as the carriage moves beek und forth.

Upon the rod 5l is'a-djustuhly mount-ed 'the sleeve 53 provided with. the finger 54 extending into the path of the tap et' 47 on the upper end of the rod 45. The ower end oi the rod 45 is rovided with the crank in 56 engaging the ieiid 5?' of the holt 4t). he ooit 46 is normally held in un innermost po- `sition hy a spring 5S so :is to (muse it t0 engage the recesses 37 and 38, whenever opposite the same and thereby lock the pist-on 36 in positionf On the forward movement of the euri-inge in rig. l, the finger 54 engaging the tappen 47 on the rod 45 causes a turning of the seid rod nnd by the engagement. of its crunk pin 56 with the hend 57 of the holt 46, the said bolt will he withdrawn from the recess 37 or 38 with which it is nt the time in engagement. As soon :is the finger 54 passes the tappet 47, the spring forces the holt inward to again engage the recess 37 or 3H. At the sume time owing to the construction of the ieiid 57 of the holt l ,`t.he rod 45 will be returned toits noi'mul position, so that its tnppet will ho uguin eiignged hy the iinger 54 on the return movement of the ciiiljiage to again operate the holt 46.

lf the piston 3G and the rod 33 are locked liv the. enneigement of the locking holt 46 in eiie of the recesses 37. 38, they nro unable to participate in the displacement of the sleeve 3...' 'lnc-i'efore, according ns the forward or return movement of the eiirriagoit is taking place., one or other of the two s irai `springs 34, 35 will he compressed hy tie displacement of the sleeve 32. The gradual compression of the springF is continued until., at the moment :it which the tool is to he rem (li-.red operative or inoperative, the carriage 4 liv the intermediary of the disengaving meehanism 45, 47, releases the locking iolt 46. As soon iis the piston 36, und with it or other of the extremities of the. sleeve 32 is l the rod 33, is released, the s )ring action l situated in the huh of the wheel 8l. Upon either side of the sleeve. tif) s )iral s rings 34 Y and 35 are arranged upon tie ro( 33, the

spiiiig :i5 hearing against the piston 36 and out of operation on the return mow-'ement ol`- The. reviprocatoiy movement of thc head- ;:toek 2,' and the displacement rendering the' tool 3 operative and inoperative are effected hy means of the gear wheel 4l, whieh the piston 39 rotates in one direction for the other with its'ruek'4ll, in accordance with the direction of the movement of the rod 33. Upon the shaft-l2 of the ;:varwheel -llislixed .a .st-vond `vor wheel 43 which meshes with thv wheel l-l mounted on the screw spindle T ol' the hea'dstock 2, und tranwmits the moremvnt ol thv shaft Kl2 and whvel4l to the spindle T. By this means the headstock 2 with the tool 3 are either caused' to approach or recede from th'c work7 nce-ordina;A as the. spriner .94 or the, spring; 35 is operative. f

This particular machine has heeu described :is illustrative of a eonstrtfetional form of tin` invention. The details of the apparatus here described may however vary without depot-tint; from the spirit ofthe invention.

l. A nmehine tool, comprising a reciprocating work holder, means for rotating the work on the forward and return movement of the work holder, means for throwing said means for rota-tiner the work out of operation on :t part of the return movement of the work holder in such a manner that. the helical rotraetitfe movement of the work is changed in comparison with thc helical forward movement h5 the :nnounl required for the feed of the work, a movable tool holder at one side of the work holder yielding means for moving the tool out of the path ofthe work before said nic-:ins for rotatingr the work is thrown the work holder, means for tvnsicuiin;t Said yielding means duringr the forward and the return movement of the work holder, and a releasahle locking device for said yielding;

means.

2. A machine tool, eomprisin,"r a reciprorating; work holder. means for rotating the work on the forward and return movement of thejvork holder, means for throwingr said means for rotating' the work out of operation on al part of the return movement ofthe work holder to change the helical retroctive. movement of the work in v ,mparison with the helical forward movement hy the amount re- Vquired for thel feed of the work, a tool holder at one side of the work holder and reciprocating across the line of movement .of the same, springs tensoned on the forward and the ret-urn movement of the work holder and serving to move the tool holder out of the path of the work on the return movement of the work holder before said means. for rotatfor ing the work is thrown out of operation, end a release-blc locking device holding the springs tensioned before its release. Y

3.- A machine-tool, comprising a reciproeating work holder, gearing; for mtat-ing the work on the forward and return movement of the work holder, means for throwing said :rearing for rotating the work out of opvration on a part of the return movement of the work holder to change tin` helical retractivv movement of the work in comparison with.

the helical forward movement h v the amount 4. A machine tool, comprising a recipro.

eating work holder, gearing for rt'itatinp.,r the. work on thc forward and return movement of the work holder, means for throwing said gearing for rotating the work out of operation on a part. of the. return movement ol' the work holder to change the helical retractive movement of the work in comparison with the helical forward movement oy the amount required for the feed of the work, n tool holder at one side of the work holder, means for. reciprocating the tool holder across the line of movement of the work holder, a displaceable, 'rod dependent on said gearing;r for rotating the work holder and acting upon the Ineens for reciprocating thc tool holder to move the tool out of the path of the work on the retum movement of the work holder hefore the means for rotating the work is thrown out. of operation, two spiral springs serving as power aceumulatois and inA connection with said rod, a partmoved h thc gearing of the work holder and serving or tensioning alternately' one of said two springs on the forward and the rctu rn movement of the work holdermd two locking reeesses made in said rod for holding temioned alternately one of said eprings.

In testimony whereof I have hereunto set lmy hand in presence of two subscribing witnesses this 23d day of January l 904 n Y i BERNHARD FRANZ Vitncsses: l

i Wannen Manssu'lmu,

Fmcxr:

` 0.o. lax-Lunes,V Acting Commissioner of Prxknts.

It is hereby certified thatthe nan'xe o f the assignee n'Letters Patient No. 917,577, granted Aiu'l 6,1909, upon the application of Bernhard Franz, of Leipzig-Plagwitz; Gex-marry, for an improvemnt in Machine-Tools, was erroneously writ-ten and printed Franz 8c Massman, whereas said name should have beenfwrtten und` printed Franz Je, Maamnn and that the seid Lettere Patent should berend wi-th this correction tzherenxtrat'v the same mav conform to thev record 'of the case in`the` Patent ce. V

signed and sealed this 18m day of may, A. D., 1909. [SEAL] 'f 

